Ballpoint pen



FIG. 1 is a right front perspective view of a ballpoint pen showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and

FIG. 8 is a left side elevational view thereof in an exploded condition, the right side being a mirror image thereof. 

The ornamental design for a ballpoint pen, as shown and described. 